A hybrid approach to optimization of radial inflow turbine with principal component analysis

Energy conversion efficiency is one of the most important features of power systems as it greatly influences the economic balance. The efficiency can be increased in many ways. One of them is to optimize individual components of the power plant. In most Organic Rankine Cycle (ORC) systems the power...

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Bibliographic Details
Published in:Energy (Oxford) Vol. 272; p. 127064
Main Authors: Witanowski, Łukasz, Ziółkowski, Paweł, Klonowicz, Piotr, Lampart, Piotr
Format: Journal Article
Language:English
Published: Elsevier Ltd 01.06.2023
Subjects:
energy conversion
Hybrid algorithms
mass flow
Optimization
Organic Rankine Cycle (ORC)
power plants
Principal Component Analysis
Turbine
Turbine
Hybrid algorithms
Organic Rankine Cycle (ORC)
Principal Component Analysis
Optimization
ISSN:0360-5442
Online Access:Get full text
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Summary:Energy conversion efficiency is one of the most important features of power systems as it greatly influences the economic balance. The efficiency can be increased in many ways. One of them is to optimize individual components of the power plant. In most Organic Rankine Cycle (ORC) systems the power is created in the turbine and these systems can benefit from effective turbine optimization. The paper presents the use of two kinds of hybrid stochastic/deterministic methods for 3D blade shape optimization of a 10 kW single-stage radial inflow turbine (RIT) and compares the obtained results with those received from the stochastic or deterministic methods. Eight algorithms were used altogether, including one stochastic, three deterministic and four hybrid algorithms. Principal component analysis (PCA) was used to analyze the optimization process. 3D models of selected reference and optimized geometries were created to compare the differences in the obtained flow characteristics. At least two different geometries were found for which the efficiency increased by above 2 pp. (validated on refined grids). The increased efficiency was obtained over the entire investigated range of mass flow rate, with a value of the total-to-static efficiency of 90.6% at the nominal point obtained using a hybrid method. •3D blade optimization of 10 kW ORC single-stage radial inflow turbine is made.•Eight algorithms are used: one stochastic, three deterministic and four hybrid.•Principal component analysis is used to analyze the optimization process.•Two new geometries are found whose efficiency increased by above 2 pp.•The increased efficiency is obtained over the entire range of mass flow rate.
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ISSN:0360-5442
DOI:10.1016/j.energy.2023.127064